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burnin oil · 09-21-2021, 10:45 AM

If you have enough room in front of the fan I would look at the be cool generic GM aluminum radiator. It was 1/2 the price of a stocker and cools well. Only catch it it is slightly wider and you can't use the stock upper mounts. Easy fab job. I run this on a 400sb that was built basically as a dirt track motor. No cooling problems at idle speeds or running high RPMs in granny gear in the K20. With that said, did you use a factory dodge intercooler? The stock radiator from a 12v does just fine. I hauled a 14k RV with a turned up 12v and never had issues. Those cooled so well that when going through slight down grades the heater would start blowing cold in the winter.

09-21-2021, 10:45 AM	#2
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,919	Re: Replacement Radiator If you have enough room in front of the fan I would look at the be cool generic GM aluminum radiator. It was 1/2 the price of a stocker and cools well. Only catch it it is slightly wider and you can't use the stock upper mounts. Easy fab job. I run this on a 400sb that was built basically as a dirt track motor. No cooling problems at idle speeds or running high RPMs in granny gear in the K20. With that said, did you use a factory dodge intercooler? The stock radiator from a 12v does just fine. I hauled a 14k RV with a turned up 12v and never had issues. Those cooled so well that when going through slight down grades the heater would start blowing cold in the winter.